Did anyone happen to save or have a pic of where the release is on so I can remove the backs? Is it "inside" or "under" the fabric that is covering the posts? One back def has less filling than the other 2 so want to move that one. But like a dumb*** I tossed out that paper that was attached showing how and where it is. Thank you!

The back release is under the white fabric that covers the post once the back is on. Take a long narrow flat-head screwdriver and push it up under the white fabric to release the latch. You should be able to accomplish it without damaging the white mesh fabric.